--- a/rtree/finder.py
+++ b/rtree/finder.py
@@ -34,7 +34,10 @@
             arch = "64"
         else:
             arch = "32"
-        lib_name = f"spatialindex_c-{arch}.dll"
+        if "MSC" in sys.version:
+            lib_name = f"spatialindex_c-{arch}.dll"
+        else:
+            lib_name = "libspatialindex_c-7.dll"
 
         # add search paths for conda installs
         if (_sys_prefix / "conda-meta").exists() or "conda" in sys.version:
@@ -50,7 +53,7 @@
             # so Windows can find additional DLL dependencies.
             os.environ["PATH"] = ";".join([str(path), oldenv])
             try:
-                rt = ctypes.cdll.LoadLibrary(str(path / lib_name))
+                rt = ctypes.cdll.LoadLibrary(lib_name)
                 if rt is not None:
                     return rt
             except OSError: